WHAT IS A LEAF? 



25 



in the dewberry, in the axils of each of the 

 three parts, or in the axil of the stalk a f 

 Again, leaves are borne at nodes ; and the 



FIG. 16. 

 Leaf of Lombardy poplar. 



FIG. 17. 

 Spray of young apple leaves. 



plant axis upon which they are borne either ex- 

 tends beyond them or gives evidence that it may 

 do so. 



28. What comprises the leaf in Fig. 16 (the 



